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authorMartin Lucina <martin@lucina.net>2012-01-23 08:53:35 +0100
committerMartin Lucina <martin@lucina.net>2012-01-23 08:53:35 +0100
commite645fc2693acc796304498909786b7b47005b429 (patch)
tree4118cd4c7b9eba3ba1d6892800c79669ea94c4e9 /src/encoder.cpp
parent2c416a793ea781273a5da6742211f5f01af13a2b (diff)
Imported Upstream version 2.1.3upstream/2.1.3
Diffstat (limited to 'src/encoder.cpp')
-rw-r--r--src/encoder.cpp90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/encoder.cpp b/src/encoder.cpp
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+++ b/src/encoder.cpp
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+/*
+ Copyright (c) 2007-2011 iMatix Corporation
+ Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+ This file is part of 0MQ.
+
+ 0MQ is free software; you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ 0MQ is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "encoder.hpp"
+#include "i_inout.hpp"
+#include "wire.hpp"
+
+zmq::encoder_t::encoder_t (size_t bufsize_) :
+ encoder_base_t <encoder_t> (bufsize_),
+ source (NULL)
+{
+ zmq_msg_init (&in_progress);
+
+ // Write 0 bytes to the batch and go to message_ready state.
+ next_step (NULL, 0, &encoder_t::message_ready, true);
+}
+
+zmq::encoder_t::~encoder_t ()
+{
+ zmq_msg_close (&in_progress);
+}
+
+void zmq::encoder_t::set_inout (i_inout *source_)
+{
+ source = source_;
+}
+
+bool zmq::encoder_t::size_ready ()
+{
+ // Write message body into the buffer.
+ next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),
+ &encoder_t::message_ready, false);
+ return true;
+}
+
+bool zmq::encoder_t::message_ready ()
+{
+ // Destroy content of the old message.
+ zmq_msg_close (&in_progress);
+
+ // Read new message. If there is none, return false.
+ // Note that new state is set only if write is successful. That way
+ // unsuccessful write will cause retry on the next state machine
+ // invocation.
+ if (!source || !source->read (&in_progress)) {
+ zmq_msg_init (&in_progress);
+ return false;
+ }
+
+ // Get the message size.
+ size_t size = zmq_msg_size (&in_progress);
+
+ // Account for the 'flags' byte.
+ size++;
+
+ // For messages less than 255 bytes long, write one byte of message size.
+ // For longer messages write 0xff escape character followed by 8-byte
+ // message size. In both cases 'flags' field follows.
+ if (size < 255) {
+ tmpbuf [0] = (unsigned char) size;
+ tmpbuf [1] = (in_progress.flags & ~ZMQ_MSG_SHARED);
+ next_step (tmpbuf, 2, &encoder_t::size_ready,
+ !(in_progress.flags & ZMQ_MSG_MORE));
+ }
+ else {
+ tmpbuf [0] = 0xff;
+ put_uint64 (tmpbuf + 1, size);
+ tmpbuf [9] = (in_progress.flags & ~ZMQ_MSG_SHARED);
+ next_step (tmpbuf, 10, &encoder_t::size_ready,
+ !(in_progress.flags & ZMQ_MSG_MORE));
+ }
+ return true;
+}